Created
April 10, 2018 14:40
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Read mode/value of a specific pin using WiringPi GPIO utility
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#!/bin/bash | |
usage() { | |
>&2 printf "Usage: $0 -n <phy|wpi> [-p <int>] [-f <mode|value>]\n" | |
>&2 printf "\t-n\tNumbering rule, physical or wPi\n" | |
>&2 printf "\t-p\tPin number\n" | |
>&2 printf "\t-f\tField to read\n" | |
exit 1 | |
} | |
while getopts ":p:n:f:" o; do | |
case "$o" in | |
n) | |
NUMBERING="${OPTARG,,}" | |
NUMBERING="${NUMBERING:0:1}" | |
[[ ("$NUMBERING" == "p") || ("$NUMBERING" == "w") ]] || usage | |
;; | |
p) | |
PIN="$OPTARG" | |
;; | |
f) | |
FIELD="${OPTARG,,}" | |
FIELD="${FIELD:0:1}" | |
[[ ("$FIELD" == "m") || ("$FIELD" == "v") ]] || usage | |
;; | |
*) | |
usage | |
;; | |
esac | |
done | |
shift $((OPTIND-1)) | |
[[ -z "$NUMBERING" ]] && usage | |
read_all_gpio() { | |
DATA=`/usr/bin/gpio readall | tail -n+4 | head -n-3 | tr -s '|' | tr -d ' ' | sed -r "s/^\|.*\|(.*)\|.*\|(.*)\|(.*)\|(.*)\|(.*)\|(.*)\|(.*)\|.*\|(.*)\|.*\|$/\4\t\1\t\2\t\3\n\5\t\8\t\7\t\6/" | egrep -v $'^[0-9]+\t\t\t$'` | |
printf "$DATA" | while read line; do | |
IFS=$'\t' read -r -a TEMP <<< "$line" | |
[[ "$NUMBERING" == "p" ]] && printf "${TEMP[0]}" || printf "${TEMP[1]}" | |
printf "\t${TEMP[2]}\t${TEMP[3]}\n" | |
done | |
} | |
DATA=`read_all_gpio | sort -n` | |
if [[ -z "$PIN" ]]; then | |
printf "$DATA" | |
exit 0 | |
fi | |
PIN_DATA=`printf "$DATA" | egrep "^$PIN"$'\t'` | |
if [[ -z "$PIN_DATA" ]]; then | |
>&2 printf "No data for pin $PIN!\n" | |
exit 1 | |
fi | |
if [[ -z "$FIELD" ]]; then | |
printf "$PIN_DATA" | |
exit 0 | |
fi | |
IFS=$'\t' read -r -a PIN_DATA <<< "$PIN_DATA" | |
if [[ "$FIELD" == "m" ]]; then | |
printf "${PIN_DATA[1]}" | |
else | |
printf "${PIN_DATA[2]}" | |
fi |
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